﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace 对称加密
{
    class Program
    {
        static void Main(string[] args)
        {
            string cryptoedStr = AES8Utils.Encode("daihanlong");
            Console.WriteLine($"加密后:{cryptoedStr}");

           // 开始解密
            Console.WriteLine("开始解密....");
            string resetStr = AES8Utils.Decode(cryptoedStr);
            Console.WriteLine($"还原后:{resetStr}");

            // RTjEgH9jYffSbYavFz/cPw==


            //string cryptoedStr = AESHelp.AesEncrypt("daihanlong", "1111111111111111");
            //Console.WriteLine($"加密后:{cryptoedStr}");
            //Console.WriteLine("开始解密....");
            //string resetStr = AESHelp.AesDecrypt(cryptoedStr, "1111111111111111");
            //Console.WriteLine($"还原后:{resetStr}");

            Console.ReadKey();
        }

        const string KEY_64 = "07102412";//注意了，是8个字符
        const string IV_64 = "11111111";
        public static string Encode(string data)
        {
            byte[] byKey = Encoding.UTF8.GetBytes(KEY_64);
            // System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = Encoding.UTF8.GetBytes(IV_64);
                // System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
        }
        public static string Decode(string data)
        {
            byte[] byKey = Encoding.UTF8.GetBytes(KEY_64);
            //System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = Encoding.UTF8.GetBytes(IV_64);
                //System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            MemoryStream ms = new MemoryStream(byEnc);
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            return sr.ReadToEnd();
        }
    }
}
